WO1997047398A1 - Mit pulverlack beschichteter wärmeempfindlicher werkstoff - Google Patents
Mit pulverlack beschichteter wärmeempfindlicher werkstoff Download PDFInfo
- Publication number
- WO1997047398A1 WO1997047398A1 PCT/EP1997/002674 EP9702674W WO9747398A1 WO 1997047398 A1 WO1997047398 A1 WO 1997047398A1 EP 9702674 W EP9702674 W EP 9702674W WO 9747398 A1 WO9747398 A1 WO 9747398A1
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- WIPO (PCT)
- Prior art keywords
- powder
- laminate according
- powder coating
- coating
- radiation
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0209—Multistage baking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/029—After-treatment with microwaves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09D175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31511—Of epoxy ether
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
- Y10T428/3179—Next to cellulosic
Definitions
- the present invention relates to the coating of heat-sensitive materials, preferably wood, with powder coatings applied thereon.
- Wood is a natural, inhomogeneous and hydroscopic material. Its properties and characteristics are shaped by many influencing factors during its growth and processing. As an organic material, it is subject to constant environmental influences during its processing and use.
- the ingredients of wood including the wood moisture, play a crucial role.
- wood moisture not only the volume changes, whereby the anisotropy in the main anatomical directions adds to the problem, but also, for example, the electrical conductivity and the wetting behavior.
- the object of the present invention is therefore to provide a laminate consisting of a substrate made of heat-sensitive material, preferably to provide wood and a powder coating layer applied thereon, which at the same time minimizes the formation of bubbles and optimizes the flow properties and crosslinking.
- a laminate which can be obtained by a) heating the substrate by means of microwave radiation, b) applying a powder coating to the substrate surface, preferably by means of an electrostatic spray process, c) heating the powder coating to the sintering temperature and d) subsequent curing the paint layer.
- All heat-sensitive materials can be considered as substrates for the coating, e.g. certain solid woods, hardboard and medium density boards (MDF).
- those materials can be used according to the invention which are used in the furniture industry.
- the laminate according to the invention With the laminate according to the invention, the previous furniture surfaces in particular are to be replaced by an emission-free system.
- the powder coatings used according to the invention preferably contain epoxy resins, carboxy polyesters, catalysts, auxiliaries and, if appropriate, auxiliaries and typical powder additives, free-flowing aids.
- the epoxy resins based on bisphenol A and bisphenol F generally have a functionality of 2, the epoxidized novolac resins have a functionality of greater than 2.
- Epoxidized novolak resins with an average functionality in the range from 2.4 to 2.8 and with an epoxy equivalent weight in the range from 600 to 850 are particularly preferred in the powder coating materials of the invention.
- part of the phenolic hydroxyl groups can be etherified with alkyl or similar groups his.
- Epoxidized novolak resins can be produced by epoxidizing novolaks, which consist, for example, of 3 to 4 phenol cores which are connected to one another via methylene bridges. Alkyl-substituted phenols which are reacted with formaldehyde can also be used as novolak resins.
- Suitable epoxy resins are, for example, the products commercially available under the following names, such as araldite, grilesta or epikote.
- the epoxy resins (component A) used in the powder coatings according to the invention are solid epoxy resins with an epoxy equivalent weight of 300 to 5500, preferably 800 to 3000.
- Aromatic, aliphatic and / or cycloaliphatic epoxy resins are suitable.
- Aromatic epoxy resins based on bisphenol-A and / or bisphenol-F and / or epoxy resins of the novolak type are preferably used.
- Epoxy resins based on bisphenol-A or bisphenol-F used with particular preference have Epoxy equivalent weight from 500 to 2000.
- Novolak-type epoxy resins used with particular preference have an epoxy equivalent weight of 500 to 1000.
- epoxy resins such as Alkylene glycol diglycidyl ether or its branched secondary products, epoxy resins based on bisphenol-A or F or the like, which are flexibilized with alkylene glycols. be used. Mixtures of various of the epoxy resins mentioned are also suitable.
- epoxy functional binders for powder clearcoats are, for example, epoxy group-containing polyacrylate resins which can be prepared by copolymerizing at least one ethylenically unsaturated monomer which contains at least one epoxy group in the molecule with at least one further ethylenically unsaturated monomer which contains no epoxy group in the molecule, where at least one of the monomers is an ester of acrylic acid or methacrylic acid.
- Polyacrylate resins containing epoxy groups are e.g. EP-A-299 420, DE-B-22 14 650, DE-B-2749576, US-A-4091 048 and US-A-3 781 379 are known.
- Glycidyl acrylate, glycidyl methacrylate and allyl glycidyl ether are mentioned as examples of the ethylenically unsaturated monomers which contain at least one epoxy group in the molecule.
- ethylenically unsaturated monomers which do not contain an epoxy group in the molecule are alkyl esters of acrylic and methacrylic acid which contain 1 to 20 carbon atoms in the alkyl radical, in particular methacrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate and 2- Called ethylhexyl methacrylate.
- Acids such as acrylic acid and methacrylic acid are further examples of ethylenically unsaturated monomers which contain no epoxide groups in the molecule.
- Acid amide such as, for example, acrylic acid and methacrylic acid amide, vinylaromatic compounds, such as styrene, methylstyrene and vinyltoluene, nitriles, such as acrylonitrile and methacrylonitrile, vinyl and vinylidene halides, such as vinyl chloride and vinylidene fluoride, vinyl esters, such as, for example, vinyl acetate and hydroxyl group-containing monomers, such as hydroxyethyl methacrylate, such as hydroxyethyl methacrylate .
- the epoxy group-containing polyacrylate resin usually has an epoxy equivalent weight of 400 to 2500, preferably 500 to 1500, particularly preferably 600 to 1200, a number average molecular weight (gel permeation chromatography using a
- T G glass transition temperature
- the epoxy group-containing polyacrylate resin can be prepared by radical polymerization by generally well-known methods. Acid-functional binders can serve as hardeners for the epoxy-functional acrylates described.
- Suitable acid-functional binders are, for example, acidic polyacrylate resins which can be prepared by copolymerizing at least one ethylenically unsaturated monomer which contains at least one acid group in the molecule with at least one further ethylenically unsaturated monomer which does not contain any acid group in the molecule.
- the polyesters optionally used in the powder coatings according to the invention have an acid number of 25 to 120 mg KOH / g, preferably 30 to 90 mg KOH / g and particularly preferably 60 to 90 mg KOH / g and an OH number of at least 10 mg KOH / g, preferably of at least 15 mg KOH / g and preferably less than or equal to 30 mg KOH / g.
- Polyesters with a functionality> _ 2 are preferably used.
- the number average molecular weights of the polyesters are generally between 1000 and 10000, preferably between 1500 and 5000. FDA-approved (FDA Food, and Drug Administration) polyesters are preferably used.
- phenolic hardeners are also suitable for curing the epoxy-functional binders.
- Suitable hardener components are all solid compounds with more than one phenolic OH group, preferably 1.8 to 4 and particularly preferably ⁇ _ 3 phenolic OH groups per molecule and a hydroxyl equivalent weight, based on OH groups from 100 to 500, preferably 200 to 300.
- the prerequisite is that the combination of epoxy functional Binders and the phenolic resin reacts at a stoving temperature below 140 ° C and shows a very low yellowing.
- the epoxy resin component is usually used in the powder coatings according to the invention in an amount of 29 to 80% by weight, preferably 35 to 60% by weight, in each case based on the total weight of the powder coating.
- the hardener component is usually used in the powder coatings according to the invention in an amount of from 20 to 71% by weight, preferably from 40 to 65% by weight, in each case based on the total weight of the powder coating.
- the powder coatings according to the invention contain 50 to 90%, preferably 60 to 80% by weight of binder and 10 to 50% by weight, preferably 20 to 40% by weight of fillers.
- the powder coatings according to the invention contain one or more suitable catalysts for epoxy resin curing.
- Suitable catalysts are phosphonium salts of organic or inorganic acids, imidazole and imidazole derivatives, quaternary ammonium compounds and amines.
- the catalysts are generally used in proportions of 0.001% by weight to about 10% by weight, based on the total weight of the epoxy resin and the phenolic crosslinking agent.
- An imidazole, 2-methylimidazole, ethyltriphehylphosphonium chloride or another salt thereof can advantageously also be used as a catalyst, a quinoline derivative, as described for example in EP-B-10805, a primary, secondary or tertiary aminophenol, Aluminum acetylacetonate or a toluenesulfonic acid salt or a mixture of various of the catalysts mentioned.
- Glycidyl group-functionalized crystalline silica modifications are suitable as fillers. They are usually used in the range from 10 to 50% by weight, based on the total weight of the powder coating. In some cases, however, filler contents of more than 50% by weight are also possible.
- Crystalline silica modifications include quartz, cristobalite, tridymite, keatite, stishovite, melanophlogite, coesite and fibrous silica.
- the crystalline silica modifications are glycidyl group functionalized, the glycidyl group functionalized by a
- silica modifications based on quartz, cristobalite and fused silica which are produced by treating the crystalline silica modifications with epoxysilanes.
- the glycidyl group-functionalized silica modifications are available on the market for example under the names Silbond R 600 EST and Silbond R 6000 EST (manufacturer: Quarzwerke GmbH) and are produced by reacting crystalline silica modifications with epoxysilanes.
- the powder coating materials according to the invention advantageously contain 10 to 40% by weight, based on the total weight of the powder coating material, of glycidyl group-functionalized crystalline silica modifications.
- the powder coatings can also contain further inorganic fillers and pigments, for example titanium oxide, barium sulfate and fillers based on silicate, such as, for example, talc, kaolin, magnesium and aluminum silicates, mica and the like.
- the powder coatings may also contain auxiliaries and additives. Examples of these are leveling agents, trickling aids and degassing agents such as benzoin.
- polyesters containing carboxyl groups and hydroxyl groups can be prepared by the customary methods (see, for example, Houben Weyl, Methods of Organic Chemistry, 4th Edition, Volume 14/2, Georg Thieme Verlag, Stuttgart 1961).
- Suitable carboxylic acid components for the production of the polyesters are aliphatic, cycloaliphatic and aromatic di- and polycarboxylic acids, e.g. Phthalic acid, terephthalic acid, isophthalic acid, trimellitic acid, pyromellitic acid, adipic acid, succinic acid, glutaric acid, pimelic acid, suberic acid,vestinic acid, sebacic acid and others.
- the acids can also be used in the form of their esterifiable derivatives (e.g. anhydrides) or their transesterifiable derivatives (e.g. dimethyl ester).
- the di- and / or polyols usually used are suitable as alcohol components for the production of the polyesters, for example ethylene glycol, 1,2 and -1,3 propanediol, butanediols, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,6-hexanediol, neopentyl glycol, 1, 4-dimethylolcyclohexane, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, ditrimethylolpropane, diglycerin and others.
- the polyesters thus obtained can be used individually or as a mixture of different polyesters.
- radiation-curable powders can also be used. Powders curable with UV light or electron beams are particularly suitable. Such are described for example in EP application 0585742.
- the UV-curable powder coatings according to the invention usually consist of a solid, unsaturated polyester (maleate) and a copolymerizable solid curing component, such as e.g. Solid polyurethanes (meth) acrolyl groups (see EP 0 585 742), or polymers containing solid vinyl ether groups (see WO 93/25596).
- a solid, unsaturated polyester maleate
- a copolymerizable solid curing component such as e.g. Solid polyurethanes (meth) acrolyl groups (see EP 0 585 742), or polymers containing solid vinyl ether groups (see WO 93/25596).
- Suitable compounds are the compounds described in EP 0585 742. Copolymerizable hardeners are also known from this patent application.
- solid polyester acrylates or other copolymers containing vinyl or acrylic groups such as are described, for example, in US Pat. No. 3,574,303, can also be used as the copolymerizable curing component.
- vinyl and acrylic groups are contained in WO 93/25596.
- the powder coatings are produced by known methods (cf., for example, product information from BASF Lacke + Wegner + Wegner + Wegner, "Pulverlacke", 1990) by homogenizing and dispersing, for example using an extruder, screw kneader and others. After the powder coatings have been produced, they are adjusted to the desired particle size distribution by grinding and, if appropriate, sifting and sieving. The grain size distribution is adjusted so that at least 90 percent by mass of the powder coating particles have a particle size between 1 and 120 ⁇ m, preferably 1 and 100 ⁇ m. Powder coatings are preferably used in which at least 90% by mass of the powder coating particles have a particle size between 1 and 60 ⁇ m, preferably between 4 and 25 ⁇ m.
- the substrate to be coated is heated. This is done according to the invention by means of microwave radiation. By means of this treatment, it is surprisingly possible according to the invention to achieve an optimal coating with powder coatings.
- wood as a hygroscopic material contains moisture throughout its useful life, which is more or less high depending on the environmental conditions. The wood moisture is in equilibrium with the relative humidity of the environment. Depending on the application (inside, outside), wood and wood-based materials are adjusted to the usage-related mean values in the drying process. For indoor use, the wood moisture is usually approx. 4-8% (there may be deviations with some types of wood) and between 10 and 24% for outdoor use. Above 8% must be used for coating of wood-based materials with thermosetting lacquer materials, quality problems are increasingly to be expected.
- the wood moisture In the case of electrostatic coating of wood and wood materials with powder coatings, the wood moisture essentially determines the electrical conductivity of the materials. High moisture values generally have a negative effect on the quality and durability of the coatings.
- moisture and other volatile wood constituents escape in gaseous form, depending on the workpiece temperature and the duration of the heat.
- the risk of blistering in the coating film increases with the strength of the dehumidification or degassing. Pores and bubbles in the coating lead to a more or less severe deterioration in quality.
- the release of moisture during the heating process can also cause discolouration, deformation and shrinkage cracks on the wooden workpieces. Later wet absorption causes swelling and thus the build-up of internal tensions in the boundary layer between the carrier material and the coating as the cause of damage.
- the treatment according to the invention by means of microwave radiation now ensures that the surface of the wood does not dry out.
- the surface of the wood is heated to 80-120 ° C., preferably approximately 100 ° C., using the microwave.
- the powder coating is applied to the substrate surface. This is generally done by means of electrostatic spray processes, but preferably by means of tribo processes.
- a surface resistivity of about 10 9 to 10 10 ohms is required.
- thermally tempered wood-based materials generally have a surface resistance of 10 12 ohms and therefore cannot be coated electrostatically.
- the paint layer build-up in the tribo process is also difficult. Thinner layers (approx. 50 ⁇ m and below) are possible; are however very uneven due to the inhomogeneity of the wood material.
- the wood materials preheated by means of a microwave have a surface resistance (at the same surface temperature) of approx. Lü 8 to 10 9 ohms. This is caused by the transport of moisture from the deeper layers of the wood to the surface, because this type of heating also warms the interior of the wood material more than the surface.
- the vapor pressure caused by the electromagnetic waves drops in interior of the material capillaries, so that further transport of the moisture does not occur.
- the powder coating is sintered at temperatures from 100 to 170 ° C., preferably 120 to 160 ° C. Electromagnetic radiation is unsuitable for sintering the powder coating on wooden materials. As a rule, the powder coating is heated either by convection or by infrared rays. The heating gradient when using infrared rays is significantly better than with convective heat transfer. However, due to the high penetration depth of the IR rays, there is a risk of the capillary water boiling out even in the deeper layers or, for example, with veneered parts for "boiling" the glue. Therefore only medium and long wave infrared emitters should be used.
- a combination of IR radiators for the sintering process and convective heat transfer (nozzle dryer) for the subsequent curing reaction is preferred.
- radiation-curable powder coatings only heat is required for the sintering process.
- UV-curable powder coatings curing should start immediately after sintering, since the drop in temperature affects the reactivity of the powder. Therefore, the curing reaction is usually carried out at temperatures between 80 and 160 ° C, preferably between 90 and 150 ° C.
- UV-curable water-based paints can be cured without disadvantages even at a water content of 6%. These coatings can be smoothed even at higher surface temperatures, so that cooling of the parts before grinding is not necessary. It is important that this coating is still water vapor permeable in the temperature range between 60 and 120 ° C. in order to avoid a steam build-up below the coating in the wood-based material. Non-permeable coatings, such as polyurethane basecoats, are not suitable for these processes.
- Suitable water-based paints are the compounds described in EP 022 003 and EP 0 089 497.
- Density 1.45; highly viscous, thixotropic
- both standard formulations can be modified with 3 to 5% of an isocyanate suitable for curing water-based paints.
- Water-based varnish 3 UV-curable Basis: UV dispersion, gray acrylic dispersion
- titanium oxide titanium rutile
- Density ; 1.39; highly viscous, thixotropic
- Coating technology Rolling Consumption: 20-30 g / m 2 per layer Drying time: 2-5 min. At 80 ° C nozzle dryer UV radiation intensity: 600 mJ / m 2 (Lightbag IL 390) Lamp type: combination of Galium doped + standard Examples: powder coatings
- titanium oxide titanium rutile 2160
- Powder coating 3 UV curable
- Hardening melting 5 min. 140 ° C + radiation dose 400 mJ / cm 2 (Lightbag 390)
- Powder coating 4 UV-curable Basis: Maleate + Acrylolurethan white
- Hardening melting 5 min. 140 ° C + radiation dose 600 mJ / cm 2 (Lightbag 390)
- Coating example 1 MDF with white epoxy polyester powder
- MDF Medium density fibreboard
- the plate prepared in this way is heated to a surface temperature of 100 ° C in a microwave channel (2 min. with 5x2 kW Gen. output)
- Example 2 * The powder from Example 1 is then applied all around using a tribospray device.
- MDF Medium density fibreboard
- the plate prepared in this way is coated with water-based varnish 3 in the rolling process (application quantity approx. 30 g / m 2 ) and in a microwave channel
- Example 2 * The powder from Example 1 is then applied all around using a tribospray device.
- Coating example 3 MDF with UV powder and white conductive base
- MDF Medium density fibreboard
- the plate prepared in this way is coated with water-based varnish 3 in the rolling process (application quantity approx. 30 g / m 2 ) and in a microwave channel
- Example 4 * The powder from Example 4 is then applied all around using a tribospray device.
- Coating example 8 Solid beech steamed transparent with UV powder
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT97923999T ATE228893T1 (de) | 1996-06-07 | 1997-05-26 | Beschichtung eines wärmeempfindlichen werkstoffs mit einem pulverlack |
JP10501111A JPH11510738A (ja) | 1996-06-07 | 1997-05-26 | 粉末塗料で被覆した熱に敏感な材料 |
EP97923999A EP0846033B1 (de) | 1996-06-07 | 1997-05-26 | Beschichtung eines wärmeempfindlichen werkstoffs mit einem pulverlack |
DE59708883T DE59708883D1 (de) | 1996-06-07 | 1997-05-26 | Beschichtung eines wärmeempfindlichen werkstoffs mit einem pulverlack |
US09/011,547 US6296939B1 (en) | 1996-06-07 | 1997-06-26 | Heat-sensitive material coated with powder paint |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19622921.9 | 1996-06-07 | ||
DE19622921A DE19622921C3 (de) | 1996-06-07 | 1996-06-07 | Verfahren zur Herstellung eines Schichtstoffes und dessen Verwendung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997047398A1 true WO1997047398A1 (de) | 1997-12-18 |
Family
ID=7796409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/002674 WO1997047398A1 (de) | 1996-06-07 | 1997-05-26 | Mit pulverlack beschichteter wärmeempfindlicher werkstoff |
Country Status (7)
Country | Link |
---|---|
US (1) | US6296939B1 (de) |
EP (1) | EP0846033B1 (de) |
JP (1) | JPH11510738A (de) |
AT (1) | ATE228893T1 (de) |
CA (1) | CA2229005A1 (de) |
DE (2) | DE19622921C3 (de) |
WO (1) | WO1997047398A1 (de) |
Cited By (5)
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EP0909222A1 (de) * | 1996-05-20 | 1999-04-21 | Ballina Pty. Ltd. | Beschichtungsverfahren und dazu verwendbare zusammensetzungen |
GB2333725A (en) * | 1998-01-30 | 1999-08-04 | Meristem Furniture Group Limit | Powder coating of wood-based products |
US6461782B1 (en) * | 1998-03-11 | 2002-10-08 | Sanyo Chemical Industries, Ltd. | Toner and method for image formation |
EP1258296A1 (de) * | 2001-05-18 | 2002-11-20 | Dsm N.V. | Pulverbeschichtetes poröses Substrat und Verfahren zur Pulverbeschichtung eines porösen Substrats |
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WO1990002613A1 (en) * | 1988-09-05 | 1990-03-22 | James Hardie & Coy. Pty. Limited | A method of forming a film for paint |
EP0390636A1 (de) * | 1989-03-31 | 1990-10-03 | Elf Atochem S.A. | Verbundmaterial, enthaltend ein Substrat und eine polymere Beschichtung, und Verfahren zur Herstellung dieses Verbundmaterials |
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-
1996
- 1996-06-07 DE DE19622921A patent/DE19622921C3/de not_active Expired - Fee Related
-
1997
- 1997-05-26 WO PCT/EP1997/002674 patent/WO1997047398A1/de active IP Right Grant
- 1997-05-26 AT AT97923999T patent/ATE228893T1/de not_active IP Right Cessation
- 1997-05-26 DE DE59708883T patent/DE59708883D1/de not_active Expired - Fee Related
- 1997-05-26 EP EP97923999A patent/EP0846033B1/de not_active Revoked
- 1997-05-26 JP JP10501111A patent/JPH11510738A/ja active Pending
- 1997-05-26 CA CA002229005A patent/CA2229005A1/en not_active Abandoned
- 1997-06-26 US US09/011,547 patent/US6296939B1/en not_active Expired - Fee Related
Patent Citations (2)
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WO1990002613A1 (en) * | 1988-09-05 | 1990-03-22 | James Hardie & Coy. Pty. Limited | A method of forming a film for paint |
EP0390636A1 (de) * | 1989-03-31 | 1990-10-03 | Elf Atochem S.A. | Verbundmaterial, enthaltend ein Substrat und eine polymere Beschichtung, und Verfahren zur Herstellung dieses Verbundmaterials |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0909222A1 (de) * | 1996-05-20 | 1999-04-21 | Ballina Pty. Ltd. | Beschichtungsverfahren und dazu verwendbare zusammensetzungen |
EP0909222A4 (de) * | 1996-05-20 | 2004-09-08 | Ballina Pty Ltd | Beschichtungsverfahren und dazu verwendbare zusammensetzungen |
EP0841100A1 (de) * | 1996-11-06 | 1998-05-13 | Rohm And Haas Company | Verfahren zum Härten von Beschichtungszusammensetzungen |
GB2333725A (en) * | 1998-01-30 | 1999-08-04 | Meristem Furniture Group Limit | Powder coating of wood-based products |
GB2333725B (en) * | 1998-01-30 | 2001-06-27 | Meristem Furniture Group Ltd | Powder coating of wood-based products |
US6461782B1 (en) * | 1998-03-11 | 2002-10-08 | Sanyo Chemical Industries, Ltd. | Toner and method for image formation |
EP1258296A1 (de) * | 2001-05-18 | 2002-11-20 | Dsm N.V. | Pulverbeschichtetes poröses Substrat und Verfahren zur Pulverbeschichtung eines porösen Substrats |
WO2002094453A2 (en) * | 2001-05-18 | 2002-11-28 | Dsm Ip Assets B.V. | Powder coated porous substrate and a method for powder coating a porous substrate |
WO2002094453A3 (en) * | 2001-05-18 | 2003-12-31 | Dsm Ip Assets Bv | Powder coated porous substrate and a method for powder coating a porous substrate |
Also Published As
Publication number | Publication date |
---|---|
EP0846033B1 (de) | 2002-12-04 |
DE19622921C2 (de) | 1999-09-02 |
DE19622921A1 (de) | 1997-12-11 |
CA2229005A1 (en) | 1997-12-18 |
ATE228893T1 (de) | 2002-12-15 |
EP0846033A1 (de) | 1998-06-10 |
DE19622921C3 (de) | 2003-09-18 |
US6296939B1 (en) | 2001-10-02 |
DE59708883D1 (de) | 2003-01-16 |
JPH11510738A (ja) | 1999-09-21 |
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